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This content will become publicly available on September 23, 2018

Title: A micro-scale cutting model for UD CFRP composites with thermo-mechanical coupling

Cutting a unidirectional carbon fiber-reinforced polymer (UD CFRP) structure is the basic unit for CFRP machining, which is a complex thermal-mechanically coupled process. To reveal the deformation mechanism and predict cutting force in UD CFRP micro cutting, a micro-scale fracture model for UD CFRP cutting with thermal-mechanical coupling is demonstrated in this paper, which captures the failure modes for fibers, matrix and the interface based on a micro-level RVE using a relatively simple damage based fracture method. The thermal-mechanical coupling model at the micro scale is developed on the basis of the plastic energy dissipation and frictional heating during cutting. Failure models for the fiber, matrix and interface region are applied depending on the material properties of each of these three phases. Numerical simulations based on the above model with different fiber orientations were performed to predict the deformation and forces of different components in UD CFRP. Cutting experiments with the same fiber orientations as considered in the simulations were carried out to validate the force and deformation results. The predicted force and deformation patterns match well with evidence from our experiments. In general, the cutting force is larger than the thrust force regardless of fiber orientation. The cutting forcemore » reaches a maximum as the fiber orientation approaches 90 , but thrust forces do not vary substantially across cases. When the fiber orientation is acute, the deformation of fibers is much smaller than when the cutting angle is obtuse. Surface roughness follows the same trend with cutting angle as fiber deformation.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [2]
  1. Northwestern Polytechnical Univ., Xi'an (China)
  2. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Grant/Contract Number:
EE0006867
Type:
Accepted Manuscript
Journal Name:
Composites Science and Technology
Additional Journal Information:
Journal Volume: 153; Journal Issue: C; Journal ID: ISSN 0266-3538
Publisher:
Elsevier
Research Org:
Ford Motor Company
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Unidirectional carbon fiber reinforced; polymer; Thermal-mechanical coupling; Micro scale; Cutting; Finite element method
OSTI Identifier:
1431023